US 12,455,500 B2
Whiteboard film, whiteboard, peep prevention system
Yuji Toyota, Ibaraki (JP); and Masahiro Yaegashi, Ibaraki (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Appl. No. 17/915,526
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Oct. 14, 2021, PCT No. PCT/JP2021/038133
§ 371(c)(1), (2) Date Sep. 29, 2022,
PCT Pub. No. WO2022/091806, PCT Pub. Date May 5, 2022.
Claims priority of application No. 2020-181420 (JP), filed on Oct. 29, 2020.
Prior Publication US 2023/0123755 A1, Apr. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G03B 21/604 (2014.01); B43L 1/00 (2006.01); G02B 5/02 (2006.01); G02B 5/30 (2006.01)
CPC G03B 21/604 (2013.01) [B43L 1/00 (2013.01); G02B 5/3033 (2013.01); G02B 5/0284 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A whiteboard film comprising:
a diffuse reflection layer to diffuse-reflect visible light;
an absorptive polarizing layer having a first transmission axis that is parallel to a first direction; and
a reflective polarizing layer being disposed between the diffuse reflection layer and the absorptive polarizing layer and having a second transmission axis that is substantially parallel to the first direction, the absorptive polarizing layer being disposed directly on or adhered to the reflective polarizing layer.